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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd079bf96884af8e191f36c458f773cdfaa4783c22f2976bd7c869d79f49e9935' 
  AND token = 'k08EJRLhl1JZxaF0povYvPpH1hBnYykkvpo8mR3c+vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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