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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a59cb91a96c0bef9b221996b41e53f0b98ea967597de82c66615dfed34bcf94' 
  AND token = 'LixLzUpyFDB1ewU9X1rrjlj9EpIOFKFjFiLtwO25+Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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