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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77585f022aaadfc4c37b6f9a3f4e6fd7b5b9b43faeef24f8744cee0f4b2ae1ed' 
  AND token = 'mH74MiXbun4AdGsHyHXtXEQp3aDWxeSt/ZZReHwhHUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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