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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1736c74a90c91ad2e243f7f47cfc17e1d496263461b8647f0d847a06b2d1b10e' 
  AND token = 'R/Yi97AMxp7zzt0ZaLT91Ec1LD43TWj8ZPpKfBCm4lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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