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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f70d69bcccf23f59d44c2887cdf8f9732cb4fa6fd96d556fb7b44d97017a1a' 
  AND token = 'CEi5hAa8s2Ij8xu3n7/efun0jTvIYjXXr8iJmab/5QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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