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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8479486e5deecb4a4b6bd8140c151f33f1479e455fc676d45ce34338dbcc4db' 
  AND token = 'ony4MJDajF/5N6lByoPy+MxjSN4So5qdJz1vxLh46sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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