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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a452ec2ab7a6505af0be8561b465a1ce3a0ffb16b703d338bc3f4de0a4be9374' 
  AND token = 'elgP3/LiM6Hqw93FSSmkWxC5Ijwtl3hKF/VcceYiYMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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