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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e276ae495d981f1e9c20eef91efed58f0fb13a6fa519f562fde5f526e6e3c714' 
  AND token = 'PkzoQf7iufE6JAt8mL1Xj7hGZKGGviBnGY6FjnR9I88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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