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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4eaa7bad153d0208249a11e1ea163f02b868e4c64422afc361f57ad0d2da8e2' 
  AND token = 'HTgP59NFlAcQM0mbZRyHiVhP758b+FU+b6otE3A4L0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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