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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a6c716c996afc86a85cc142cdf6d121e43ede6a6a6387c036d30c9450f2fc5' 
  AND token = 'D7/xnxeRZRz7sVXb2ZGGesyt2qxPxrsEUb+AfY9bFHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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