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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f966cd1e079a775cc22ef33dfde0789bc6005c823fbb23042d743a951aaf74' 
  AND token = '5/2/fyeR/EfuXrgE9k9ALB8cNsD0YJRKBp3ofWSw0BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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