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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ac2207dc876db9a7054d509ae9e0af43463fe00fef731d2a63c71d782de169' 
  AND token = 'mUk2erdPJVniARiVVruen1qyYZkdALZ/BmdgnaEufJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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