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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ba2314b3408c3404243e0eeb0ad1d8c1765f872fa70dd3fc9e2e250de1880b' 
  AND token = 'cbI7/jUhKxOSqXxKpd7DzXNbG50WkaCduUCexMIKVAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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