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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e96ab44cc77698f3019b0ff8a8b939fd6b6fd085336b4c55ca9a3c78010e69' 
  AND token = 'PZSj2GiBzTSfxBZqxZkvKHEUcoidLwwZcUPpZirIhIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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