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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a03ba0642de31dca5d079c7940743710be32aa5834595df6dda541dc7b22bc9' 
  AND token = 'ANvFzZv31vo2oF9Y8cQSWXTdn+QXypgjkGwMMeQBAYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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