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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd13cc966bbaaf6f6e1c3cdc9c9ec32877f0e3f1de17fc3d04a86c091f6e277b' 
  AND token = 'x2njlxf2fh95o0fCJ0fmGHbUsvFSG4SV3K7a/+D3D6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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