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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd801b40fef8ba952d6904dc7f9e46daf8af731d50397a1a0f4171e6a50292e3f' 
  AND token = '4nZvqx/5r4i0PU53H6XLlhr6Lo9U5BlUi2nj0a/+td4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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