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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b88dbec5661ae051de3986882d79208d8e7f65523fd8c61be82b74bc031109b' 
  AND token = 'pj/1B1Fmq0RQPzoItRdL/i4dXcxSHR64GhNVV4TCf0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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