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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961c2ffb919da1a608978e943c8577e54ca1bcf6062cc1c648a94c5abb7cf971' 
  AND token = '/oT68AulUMH7o5NmUkAAQrPJfeIMByEtVwErDpgNQ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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