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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6336922aadd2f4af50692faa5d86ab2e98b3f0e50987c15a46905e4fe00d5a5a' 
  AND token = 'tQm5TH3KR22iI5Oq+5MrcpZLfQXwFmL20cFus6iom4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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