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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e1cff78cb1d5b391169e42c1f0b75bc4ef7ae19c6bae649ca426b4e07dba18' 
  AND token = 'NZnYND6Pmt5QmcG0R0fqVU0Ph30a3cgEZCopN+DBdCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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