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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402ad6bd12ce29d88d977394dfe67231d096f0bc74c4aa6714817d168176a752' 
  AND token = 'pyWIWxG9OwnN4A0qGN3bIf70Q2TkSBSs17lmOmKdBWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}