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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31f1e39a4a4fdd8128ab69cdb5492d510d06ad304de36566ccf97f17d95d140' 
  AND token = 'zGK1e/XwyQLk4EIyLOfXdeAutKF4zVc908fs559D4WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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