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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37355e4b0d4e0897c638c5bc2dad0f148af3b73f71f09fe549647c939ff0719' 
  AND token = 'AayNigt0gsaEkyAZTuPHCWL4OXyu4rT7po3gA6eWp9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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