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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107682af3406694737d9addd6be710711a9eb8033287b598ed6dfb9782f3d622' 
  AND token = '7ksMhPr4qYrLDUdJxqpe1KE7zrgrP37iZ2OKVMI+/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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