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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90229bcffe9e82fb9b9d602fe377975ecbd2c75a3568a136c1c77fc28dba07ce' 
  AND token = '9RCpnaJy/64dTI/UPOEV1/C8qXxZw4I3M2wfDvtfMmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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