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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4a3ef71e1c86845b4dbf4d252930790637446b4279d52b5a4ba3babe6f109c' 
  AND token = 'L8PvbLw6oK/vJwHaRsdxLNouU8G37joKUMgick77xu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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