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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68606b9e04aa21b91f0c1e89c552565ee62f01e2493855b78c3f941f2fc7a75' 
  AND token = 'xUCcm91dIBbkLeiXvUerK/vwniLvAsPTQ74CyAYoCXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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