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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007c711c88f8f79047cef0906eb7056946e43bd91015fc332a9ee195de679502' 
  AND token = 'BMLiMOBXXLczcBMhYWlkPVqUUd/0HLMS5pOWqgBwrIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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