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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84730c983a8c2483ffad82b095d03d13129403d91cb30d94694f3afb47341fd7' 
  AND token = 'lZHtZi8JL5x4YCId8OPzK61tn4ab24SqnJYtnIKiL5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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