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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d2d080eb6d2f358051fe7c505487f6b11ba8f6860f43f65c1bbe2f03cb17c0' 
  AND token = 'bx4J7PpOkmoaK4Mi0UgovvsicncMRlCR+yKzc3uZyrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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