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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6051f4f11694d21aac2874f5fae2f62c283e4a112ac26beac81717791e476a' 
  AND token = '+bwOfN+6tGjXSD3KOhkHNkU3xY5pfLW1ruqTaI9Iz78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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