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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d1f66833e9b318f4f5f41aca63703dac1aecf5d72b9d2757795a026be4a35d' 
  AND token = 'PNvePUbfmd+sPYddJo02p+nYTJfPZo4rxyXL3gwWX/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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