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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bad8ae3d8742c4c50f328a084f10fe1714880cd7c13c2e7da8c7126bf9b5a0' 
  AND token = 'oOdOC2Ffh2Wboj9XaCQX5977MbLyCikgwwKj/jZGzAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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