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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca6c14cf21f5aa9470f219fb1f49d06f95c1a9ace69ffa74336c76861cdd9f4' 
  AND token = 'Nj5BSWR8JTMT12REwKt7Tv6ZaWL+nE18ZsGBPTmWHX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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