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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8671191baab78cc4647f52a32cf835fdf2ed54983803341ced5f725efb1c3cd5' 
  AND token = 'G6IzhmjZxt5ZMk/riKnGPk2kC+G7a07y9wahy/dZuko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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