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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01634a091a5b6bcf8ab93bae9b0a35138a439972307e6fbe2461f8c9ca39b52' 
  AND token = 'aIYCuq+gYNgpfBocf4sTSzwPuWg8hM8KYI1c58YyXpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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