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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b0b80f2c67d7758612570d07772d8aa80a382802f2696ff3e78de6023d775d' 
  AND token = 'xG1FBS3hOOI0S6uTbimp8f3ZfkaSlVrqCRn54Z6H/Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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