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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2484ef26d80d0dc0cbcc7f0c4f3fe89dab3fe0465b371828c2b111a9fbc72d18' 
  AND token = 'DA0vZl2EW24XfCmiYYwIBm+7VXOJeClhUmPYtRebW+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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