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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3842567d22e01751aaec218adbfad472b460b3ad251b5e175a87feb2d45a6b6' 
  AND token = 'Ngh0oLz62xY1QrS7Dcc/X7md2pkFxFPGO/ogZmKIV8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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