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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0469dcd99f258de203368d395488654aae7b2963669b3e2bf46a22f3ec3ca19' 
  AND token = 'EI32fnKOcZzMQyRRfOTPXrqbgyL6g0N+s35Uabi//1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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