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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882f5dc39b13e61f0d6f7a9d2d3975eccd923e02819c6a6d6fdabdde84eccfe1' 
  AND token = 'WB4bTbkEaKkZL/GValzSBQeDyyXZxk+Dx/okW2JZjtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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