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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150c48e33b65719d059cead0c6f573772d7ff483fbc6e08380c6ca9c5ed71bd8' 
  AND token = 'SwveTKxoTBA4OCFgAuXsIzlJhF76NtWj3exqHVlyzb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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