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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b2f45f0d5387c2e7ebf6a36f159ff7034bded999d88c0be2d7df3f97d101ae' 
  AND token = '/sgMnOKTOtc55jYWbj1jSMhy5QK5Flf8i9mwieIBjOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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