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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f60adf5129740945e3f527f01a2ad3a035a1e5b40598244c59eeeb5f3485cb1' 
  AND token = 'DRwcmZjc+yd64eioM6lLez/GiWNBjqHxkSNuSA31Yjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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