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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05419fddf64ead1598c0ea9ac2bec6fc57d3ceb7859742039e53c487314a9d90' 
  AND token = 'e7T1aRTMAJ9Zw9o5XBQI2fu9plSni+eDPfjqip3vlCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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