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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f2e62ef08419af6c63e0fa3aa98ea64830fa8c08650aaf5a34b9f549c6b013' 
  AND token = 'qFciQ4J4HiRHhaAf3xURD9OVV8w7qWrXPqYEOASiUpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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