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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fb3b0197e22d29c4f43d06794451d682d04c21034f519c256a09fd9f59848f' 
  AND token = '5hYKE/QUXYaL4JLdt1GCjgt8MEYf/L1/VdFGb5FUKcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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