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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e5ec6b1c8b6a9783f5ce9d55f286de873709620792687fc8ddd49837a370c2' 
  AND token = 'PwOJ5L8nuA+8u84jsS8OogpShGaYmL/3IM8sHZyeJyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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