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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbefab49433249f11a96a47382337db4e75a3d955cd180568bfb28cf8b1398e' 
  AND token = '8Yp781Rm9c9hamKEC0GktrlXA7mqAfh8w9hGX9CScfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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