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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f231b0b51daaa3100534acee0f8fc71a835670c4d645578b40f90c51bf8c98c' 
  AND token = '7f2NxF0bhXKovCAIshd0MDOo5JTCtLF8ITPMpWBs1JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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