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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f477ccaba869ace680f438b72c14e6269a5ae5d6880e024978ee3bdd17e3775' 
  AND token = '9TzCtXg2AD4JAWhVKnO6PKHuFs33U7xQRVxErGnuiyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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