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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37115e62072bc036a40430aed49f73499619aa384acb3f0cd81841bad0d3cac3' 
  AND token = '7gJRygPHfq+1KkQY7NSU5+5oTBikDcx9xduJFCXZbDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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