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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e7033d19972ce74e1bb5e98cec78e6fb16ff53b2e460d23e2ea27edd7d2422' 
  AND token = '/wUDqJtzE96II2TgMiziG1f1P0KMXK2pXCqH6+acfk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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