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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783f19150ee9cac03082e23a0750ba1f52da4b0620176404448303acc3da40e8' 
  AND token = '31Vkl9W2FlqLvoADz07k6KB0sczHXVIwoRYGK/pTs8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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