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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7628cf47b3ff537e9ba0528a8b8312ace082bf08ce395bdf3ace0fd3a09614d0' 
  AND token = 'IHssbU30Czs56YiMD4lYj6zAwiBZZZbl/b9/cRR8TmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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