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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e1a5448cf1d84f2f1588043f93f3545289afd7ff20751ee214680001797394' 
  AND token = '5dbpb9ZNr3jeDVpNZ+8cp7rxidx0y5PFCp+eYO1y+8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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