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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d99318e997113897836043f3e1f6f8e6fdf00d38bb238cd8c98d0d91cc4115' 
  AND token = 'fOVWwyR6ATPCqsNaLpcDIjSAwMT59QOGP9u7d2kJVTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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