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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b359d01b707aca6168a9c2a7627a8544beb77c338a41cd3e943dd53741c4f17e' 
  AND token = '1IvJpbfAlcY5gp6FddyfSixRAVxWZiuRwEecDjT1vNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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