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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b9690460246e55f6ec293d181dfa0b4f2f2c644dc1e6290baca4d027debb1d' 
  AND token = '/OEbMhf07Ua6Sj6r8l243NPq3hHejKUYE1Do85VDZeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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