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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb385f08de3fe6e242d583c6d3890e1fe33cad1f943de3b71f87ee0ee0d60240' 
  AND token = 'C7z8ykfLWuez/54tPuUv3B0YsYY9AFHWy0MVOfdEd3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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