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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f5e2541241ef80150b064f7d96e541c9301a474cd4085448108ec5581ed6e6' 
  AND token = 'm2nB7uUA9YwZ/W4Gldf17Tgx8OxNnncWCMqW0G3sHtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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